I asked the original reporter of launchpad bug #771370 if he could test the different radeon options suggested here & it turned out he doesn't see any corrupted graphics anymore – so it seems he was affected by another bug.
Regarding my experiences using Option "EXAPixmaps" "off": It still works great, I just saw a minor screen corruption once; ram & swap usage look quite normal – but I have to test this over a longer period and report back later.
I asked the original reporter of launchpad bug #771370 if he could test the different radeon options suggested here & it turned out he doesn't see any corrupted graphics anymore – so it seems he was affected by another bug.
FYI: My original report on launchpad is bug #766693 /bugs.launchpad .net/xserver- xorg-driver- ati/+bug/ 766693
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Regarding my experiences using Option "EXAPixmaps" "off": It still works great, I just saw a minor screen corruption once; ram & swap usage look quite normal – but I have to test this over a longer period and report back later.